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Basin 17 - Lake Memphremagog, Coaticook and Tomifobia Rivers Basin Planning


What's New

A Lake Memphremagog Tactical Basin Planning kick off meeting was held on June 8th to kick off the public phase of the tactical basin planning process.  The tactical basin plan will serve as the guidebook for water qualiy protection and restoration efforts in this basin for the next five years. The Vermont Department of Environmental Conservation provided updates on water quality challenges in the Lake Memphremagog watershed, progress that has been made over the last five years improving waters for fishing, swimming and boating, and got local input on how we can improve these efforts over the next five years. This information is being complied into a draft plan that will be released for public comment in Late 2022 or early 2023.  This meeting included the presentation of a StoryMap that can be viewed online.

The process to update the Lake Memphremagog Tomifobia and Coaticook tactical basin plan was initiated in 2019 with a round of water quality monitoring and a year for assessing this date to determine conditions of waters across this watershed.  In the summer and fall of 2021 partners across watershed provided updates to the 66 strategies that were identified in the 2017 plan showing that over 80% have been initiated or completed since this plan was published.  The status and updates on these strategies is available at this link Basin 17 report card.

Basin 17 includes the Vermont portions of the St. Francis River Watershed encompassing a total of 589 square miles between the Lake Memphremagog drainage and the Tomifobia and Coaticook River watersheds. The Vermont portion of this basin includes the Black, Barton and Clyde Rivers and many lakes and ponds, including Great and Little Hosmer Lakes, Lake Parker, Shadow Lake, Crystal Lake, Lake Willoughby, lake Salem, Island Pond, Great and Little Averill Ponds, Norton Pond, Holland Pond and Seymour Lake.  

Phosphorus Total Maximum Daily Load (TMDL) and 2017 Tactical Basin Plan

Lake Memphremagog is shared with the province of Quebec, with a majority of the lake in Quebec, but a majority of the watershed in Vermont. Phosphorus levels in Lake Memphremagog are above the Vermont State Water Quality Standards. Excess phosphorus that runs off the land into the lake causes occasional cyanobacteria blooms and nuisance plant and algae growth, which limit the recreational use of the lake. The Total Maximum Daily Load or TMDL for Lake Memphremagog, developed using lake and watershed models and approved by the Environmental Protection Agency (EPA) in September 2017, calls for a 29% reduction in phosphorus inputs. 

The Lake Memphremagog, Coaticook and Tomifobia Tactical Basin Plan was approved in November of 2017. It identifies specific actions to reduce phosphorus and sediment pollution from farmland, roads, developed lands, wastewater treatment facilities, forest lands and wetlands, along with addressing water level fluctuations and aquatic invasive species spread over the next five years. It also outlines additional concerns in the basin, including two streams, Roaring Branch and an unnamed tributary to Stearns Brook that are impaired from nutrient runoff from farms; 13 additional lakes in the watershed with either elevated levels of phosphorus or increasing phosphorus trends; water level fluctuations on lakes and streams in the Coaticook watershed; and the spread of aquatic invasive species. The Vermont Department of Environmental Conservation adopted a new wastewater treatment facility wasteload allocation for facilities in the Lake Memphremagog watershed.

Learn about projects in your area, and view more than 350 specific actions for the Lake Memphremagog, Tomifobia and Coaticook Basin through the Watershed Projects Database. Select "Basin 17-Lake Memphremagog" and click on the “Search” button. 

Visit the Restoring Lake Memphremagog webpage to learn more about the Lake Memphremagog TMDL and work of the Quebec Vermont Steering Committee on Lake Memphremagog.

Contact Ben Copans at 802-490-6413 with any questions about the TMDL or tactical basin plan.


Additional Resources